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Astron. Astrophys. 336, 425-432 (1998) AcknowledgementsWe would like to thank G. Djorgovski for a discussion concerning the abundance of close quasar pairs. D.B is supported by the Praxis XXI CIENCIA- BD/2790/93 grant attributed by JNICT, Portugal.
© European Southern Observatory (ESO) 1998 Online publication: July 20, 1998 ![]() |